DOI: 10.1016/j.palaeo.2016.06.024
论文题名: Paleoenvironmental proxies in echinoid spines (Eucidaris galapagensis, Döderlein 1887) along a natural water temperature gradient
作者: Müller P. ; Reymond C.E. ; Siegel P. ; Westphal H.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 484 起始页码: 70
结束页码: 78
语种: 英语
英文关键词: Carbon isotopes
; Echinoid spines
; Galápagos archipelago
; Mg/Ca ratio
; Oxygen isotopes
; Paleoenvironmental proxies
英文摘要: The use of paleoenvironmental proxies such as oxygen isotopes in echinoderm skeletons has been a matter of controversial debate. Many previous studies showed a variety of environmental as well as biological processes causing deviations from equilibrium incorporation of geochemical proxies during the formation of echinoderm skeletons. However, given the global distribution of echinoids, their fast spine growth and their occurrence throughout the entire Phanerozoic, species-specific calibrations of geochemical proxies in echinoid spines can disclose a valuable bio-archive for reconstructing ancient environmental conditions throughout Earth's history if samples are adequately preserved in the sedimentary record. Here we present data on oxygen isotopes (δ18O), carbon isotopes (δ13C), and Mg/Ca ratios measured in Eucidaris galapagensis (Döderlein, 1887) spines, which were sampled along the natural water temperature gradient of the Galápagos archipelago. We found a negative correlation of δ18OCalcite with ambient water temperature following the equation 1000 ln (α) = 23.03 (103T− 1 [K]) − 47.90. We also found δ13CCalcite be positively correlated with water temperature following the equation δ13CCalcite(VPDB) = − 47.585 + (0.164 ∗ T[K]. Mg/Ca ratios also showed a significant correlation with water temperature, however, with a low correlation coefficient. The large scatter of δ18OCalcite values within the upwelling region indicates higher growth rates during seasons of colder water temperatures. Considering this and the observed steeper slope in the temperature-δ18OCalcite relationship, our data suggest that the common assumption of respiration affecting oxygen isotope fractionation does not apply for the tropical species E. galapagensis. Overall, our data show that E. galapagensis spines represent valuable paleoenvironmental archives which might have the potential to provide sub-annually resolved water temperature records if spine architecture and growth pattern are well constrained. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/67763
Appears in Collections: 过去全球变化的重建
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作者单位: Leibniz Center for Tropical Marine Ecology (ZMT), Fahrenheitstr. 6, Bremen, Germany; University of Bremen, Klagenfurter Str. 4, Bremen, Germany; University of Essex, Wivenhoe ParkColchester, United Kingdom
Recommended Citation:
Müller P.,Reymond C.E.,Siegel P.,et al. Paleoenvironmental proxies in echinoid spines (Eucidaris galapagensis, Döderlein 1887) along a natural water temperature gradient[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,484